> On 22 Mar 2018, at 15:13, 陈 永岗 <cy...@outlook.com> wrote:
> 
> 
> Hello everyone,
> 
> 
> I'm newbie to ffmpeg, and found ffplay.c is very useful which contains lots 
> of command line operations. If press 's', it will play next frame. However I 
> want to make it support playing previous frame. Where should I start? Any 
> recommendations?
https://ffmpeg.org/developer.html
https://ffmpeg.org/git-howto.html

You can reference these documents to get how to contribute to ffmpeg.
Patch welcome :D

> 
> 
> Best regards
> 
> Dom
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel

Thanks
Steven





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